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module/hotplug: Extend hotplug support with 'fail' and 'states' interfaces

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The Linux HP path is composed of a series of states the CPU has to execute
to perform a complete hotplug or hotunplug. Devlib now exposes this
information. get_state() gives the current state of a CPU. get_states()
gives the list of all the states that composes the HP path.

The Linux HP 'fail' interface allows to simulate a failure during the
hotplug path. It helps to test the rollback mechanism. Devlib exposes this
interface with the method fail().
This commit is contained in:
Vincent Donnefort 2021-04-12 11:23:23 +00:00 committed by Marc Bonnici
parent 9f55ae7603
commit a5cced85ce
1 changed files with 20 additions and 0 deletions
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20
devlib/module/hotplug.py
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@ -57,3 +57,23 @@ class HotplugModule(Module):
return
value = 1 if online else 0
self.target.write_value(path, value)
def _get_path(self, path):
return self.target.path.join(self.base_path,
path)
def fail(self, cpu, state):
path = self._get_path('cpu{}/hotplug/fail'.format(cpu))
return self.target.write_value(path, state)
def get_state(self, cpu):
path = self._get_path('cpu{}/hotplug/state'.format(cpu))
return self.target.read_value(path)
def get_states(self):
path = self._get_path('hotplug/states')
states_string = self.target.read_value(path)
return dict(
map(str.strip, string.split(':', 1))
for string in states_string.strip().splitlines()
)